Improvement in steam-cylinders



Seam-ylinders.

Patented Dec.31, 1872.

@Wen/Z012' WILLIAM OORLISS, OF PROVIDENCE, RHODE ISLAND.

IMPROVEMENT IN STEAM-CYLINDERS.

Speeication forming part of Letters Patent No. IISLSG, dated December31, 1872.

To all whom it may concern."

Be it known that I, WILLIAM OORLISS, of Providence, Rhode Island, haveinvented a certain Improvement in the Manufacture ot' Steam-Cylinders,of which the following is a specification:

The improvement relates to the method of manufaturing. I harden theinterior after the cylinder is formed. The importance of a hard interiorhas been long recognized, and efforts have been made to attain the sameby cast-iron on chills. Such means to attain the desired end dii'ersubstantially from my process in that the hardening is effected whilethe cylinder is being formed. It involves diiiculties which myinvent-ion completely overcomes.

The following is a description of what I consider the best means ofcarrying out the inp vention.

I form a bushing or thin hollow cylindrical lining, adapted to besecured in the interior of an ordinary soft castiron cylinder. Thisbushing is either altogether steel hardened only on its inner surface byjetting water or oil from a suitable pipe in the interior; or it isformed of steel on the eXtreme inner surface alone, the remainder beingsoft iron. In either case it is first formed in the complete shape, andis afterward hardened on -the inner surface while the outside remainsrelatively soft and tough.

1f, in the operation of hardening, the surface becomes warped ordistorted in any manner, the proper mathematically-exact form may begiven to the interior afterward by suitable grinding processes. It isimporta-nt, however, that the material be shaped as exactly as possibleto the proper form and size before the hardening operation.

The accompanying drawing forms a part of this specification, and showsmy improved cylinder as completed.

Figure l is a side view, paitly in section, and Fig. 2 is an end view.

Similar letters of reference show like parts in each.

ing the soft portion, and the part ct being the hard portion. Ordinarilythe line between the hard and the soft parts will not be visible to theeye, because both are one and the same piece of metal, with littledifference of color. B1 B2 are parts of a surrounding and inclosingcylinder, which, in this case, is formed separately.

I claim as my inventioni The Within described process or method ofmanufacture of steam-cylinders, the cylinder being formed into shapewhile in a soft state, and afterward hardened on the interior surface,leaving the outer parts relatively soft, as herein specified.

In testimony whereof I havehereunto set my hand this 11th day of May,1872, in the presence of two subscribing Witnesses.

WILLIAM OORLISS.

Witnesses:

WM. C. DEY, ARNOLD HRMANN.

A a represent the bushing, the part A be-i

